Two people who are extremely close friends to the point that they love the same things, can easily complete each others sentences or talk simultaneously, and always know what the other person is thinking or would say in a situation. They get along perfectly and hardly ever fight. Other friends are jealous of their closeness and they are thought of as inseparable - you never see one without the other. Usually brain twins are two girls or a girl and a gay boy.
John, the popular jock, had finally gotten the nerve to ask Anna to the dance. She was, as usual, walking with her friends Allie, Cameron, and Zeke. When John approached them, he was happy how excited Anna looked to have been asked by him. But Zeke, because they were brain twins, knew only by looking at her that she would much rather have gone with anyone else, though John, Allie, and Cameron had been fooled.
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